package com.gongj.apppay.utils;
import sun.misc.BASE64Encoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
public class RequestUtil {


    /**
     * 向指定 URL 发送POST FORM方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 key-value 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPostForm(String url, Map<String, String> param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";

        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());

            String body = "";
            for (String key : param.keySet()) {
                body += "&" + key + "=" + URLEncoder.encode(param.get(key), "UTF-8");
            }
            body = body.substring(1);
            System.out.println(body);
            // 发送请求参数
            out.print(body);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
        }
        //使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
            }
        }
        return result;
    }

    public static void main(String[] args) {

        try {
            Map<String, String> params = new HashMap<>();

            Long timestamp = System.currentTimeMillis();
            //这里面是文档里面的参数，格式是JSON
            String msgData = "{\n" +
                    "\"trackingType\":\"1\",\n" +
                    "\"trackingNumber\":\"SF1011330100358\",\n" +
                    "\"methodType\":\"1\",\n" +
                    "\"checkPhoneNo\":\"\"\n" +
                    "}";
            //这个是授权的MD5Key
            String md5Key = "2Z7YPBNG2CKKBV17";
            //这个是接口对应的service code
            params.put("serviceCode", "FOP_RECE_LTL_SEARCH_ROUTER");

            params.put("partnerID", "fop_test");
            params.put("requestID", UUID.randomUUID().toString());
            params.put("timestamp", timestamp + "");
            params.put("msgDigest", genDigest(timestamp.toString(), msgData, md5Key));
            params.put("msgData", msgData);


            String data = sendPostForm("http://sfapi.sit.sf-express.com:45290/std/service", params);
            System.out.println(data);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String genDigest(String timestamp, String mgsData, String md5key) throws Exception {
        //将业务报文+时间戳+秘钥组合成需加密的字符串(注意顺序)
        String toVerifyText = mgsData + timestamp + md5key;

        //因业务报文中可能包含加号、空格等特殊字符，需要urlEnCode处理
        toVerifyText = URLEncoder.encode(toVerifyText, "UTF-8");

        //进行Md5加密
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update(toVerifyText.getBytes("UTF-8"));
        byte[] md = md5.digest();

        //通过BASE64生成数字签名
        String msgDigest = new String(new BASE64Encoder().encode(md));

        return msgDigest;
    }
}
